Generated on Thu Apr 11 13:59:20 2019 for Gecode by doxygen 1.6.3

hw-rnd.cpp

Go to the documentation of this file.
00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Christian Schulte <schulte@gecode.org>
00005  *
00006  *  Copyright:
00007  *     Christian Schulte, 2012
00008  *
00009  *  This file is part of Gecode, the generic constraint
00010  *  development environment:
00011  *     http://www.gecode.org
00012  *
00013  *  Permission is hereby granted, free of charge, to any person obtaining
00014  *  a copy of this software and associated documentation files (the
00015  *  "Software"), to deal in the Software without restriction, including
00016  *  without limitation the rights to use, copy, modify, merge, publish,
00017  *  distribute, sublicense, and/or sell copies of the Software, and to
00018  *  permit persons to whom the Software is furnished to do so, subject to
00019  *  the following conditions:
00020  *
00021  *  The above copyright notice and this permission notice shall be
00022  *  included in all copies or substantial portions of the Software.
00023  *
00024  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00025  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00026  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00027  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00028  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00029  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00030  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00031  *
00032  */
00033 
00034 #ifdef _MSC_VER
00035 
00036 #define _CRT_RAND_S
00037 #include <stdlib.h>
00038 
00039 #include <gecode/support.hh>
00040 
00041 namespace Gecode { namespace Support {
00042 
00043   unsigned int hwrnd(void) {
00044     unsigned int r;
00045     (void) rand_s(&r);
00046     return r;
00047   }
00048 
00049 }}
00050 
00051 #else
00052 
00053 #include <gecode/support.hh>
00054 
00055 #include <fstream>
00056 
00057 namespace Gecode { namespace Support {
00058 
00059   unsigned int hwrnd(void) {
00060     std::fstream devrandom;
00061     devrandom.open("/dev/random", std::fstream::in);
00062     unsigned int rnd;
00063     devrandom.read(reinterpret_cast<char*>(&rnd),sizeof(unsigned int));
00064     devrandom.close();
00065     return rnd;
00066   }
00067 
00068 }}
00069 
00070 #endif
00071 
00072 // STATISTICS: support-any
00073